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Laboratories for Metrology

  • ISOTTA FRASCHI MOTORI SpA Metrological room
  • GALILEO at CENTER TELESPAZIO SPA
  • CMM Laboratory POGGIOLI SRL
  • ZANELLI SRL METROLOGY
  • CMM Laboratories Branca Idealair
  • MAGNETI MARELLI Metrological room Branca Idealair
  • MITUTOYO Laboratory for metrology and CMM by Branca Idealair
  • MICROTEC Metrological lab Branca Idealair
  • SAU (Polinago) Metrological Lab Branca Idealair
  • TELESPAZIO Spa Maser Clock controlled room by Branca Idealair
  • ISOTTA FRASCHINI MOTORI Spa Laboratory for metrology Branca Idealair
  • SECO TOOLS CMM Temperature close-control room by Branca Idealair
  • MITUTOYO Spa Metrological lab Branca Idealair
  • FRASCOLD (Rescaldina - Italy) CMM controlled temperature Lab by Branca Idealair
  • PAMA Spa (Rovereto) CMM Lab Branca Idealair
  • Politecnico di Milano Termometry dipartment Laboratory Branca Idealair
  • Laboratories for dimensional metrology Branca Idealair

Branca Lab project questionnaire

The constant precise control on Temperature is a fundamental key element for Dimensional Metrology according to the International Standard ISO 1 that fixes the reference Temperature at 20C for geometrical specifications; the requirements are generally different depending on the applications fields, on the measurements accuracy provided by the testing equipments (CMM) and on mechanical parts which have to be analyzed.

Laboratories for Metrology Branca IdealairLaboratories for CMM Branca Idealair

Even if the requirements specify that it is not compulsory that all calibrations and tests for the acceptance of mechanical and electro-mechanical parts should be carried out at 20C it mentions only that a measurement done at a different temperature may lead to apply an offset value on final results contributing to a considerable increase of measure uncertainty and consequently to a lowering of the quality, of the traceability and of the comparability of tests.

Calibrations and measurements with CMM as large bridge-type machines, bridge-type measuring machines and servo-driven gantry style machine, etc. are performed in controlled spaces with different air volumes but always at a stable Temperature control as close as possible to 20C and with a reasonably low percentage of R.H.(%) to reduce at minimum the temperature correction functions outputting more reliable and realistic measurements.

CUSTOMER REFERENCES

Acceptable limits about temperature gradients are around 0,5C, which has to be set in order to define clearly how much temperature could deviate from 20C during the test activities without penalizing too much the quality of measurements. Therefore it is definitely necessary that the air conditioning system maintains the temperature and possibly the R.H. (%) under control with a PID adjustment in order to keep its gradients very low within the laboratory apparatus.






The instruments required to measure the barometric air pressure, air temperature and relative humidity



The laboratory maintains documented uncertainty measurements results

Using air conditioners and de-humidifiers.

The barometric pressure in the laboratory should be recorded.
The value of local acceleration due to gravity (g) local should be measured /known to the best possible measurement uncertainty.

Branca Idealair offers three solutions for Metrology laboratories:

SOLUTION 1 : The Climatic Element - Branca Idealair
High accuracy measurements with the precision air conditioning handled from the "Climatic Element Branca Idealair" with a proper thermal insulation of laboratory followed by specialized technicians from S.T.A. Branca Idealair able to guarantee the thermo-hygrometric parameters below:

Temperature:
20C 0,5C
Relative humidity:
45% 5%

or:

Temperature:
23 0,5C
R.H.:
50 5%


Spatial Temperature gradient:
≤ 0,5 C/m
Temporal Temperature gradient:
≤ 0,5C/h
1C/day
Air velocity on the worktop:
≤ 0,15 m/s

Select your "Laboratory cubic meters air volume (m3)" to get more information:

  • AIR VOLUME: 9 25 m3
    Precision air conditioning unit Type MINI

  • AIR VOLUME: 20 50 m3
    Precision air conditioning unit Type 0
  • AIR VOLUME: 50 100 m3
    Precision air conditioning unit Type 1
  • AIR VOLUME: 100 200 m3
    Precision air conditioning unit Type 2
  • AIR VOLUME: 200 300 m3
    Precision air conditioning unit Type 2S
  • AIR VOLUME: 300 500 m3
    Precision air conditioning unit Type 3
  • AIR VOLUME: 500 800 m3
    Precision air conditioning unit Type 4


  • SOLUTION 2: CABINET

    Precision air conditioning unit Type CABINET

    Solution 2 is provided by an insulated chamber with Climatic unit Type "CABINET" that ensures the following reference ambient parameters:

    Temperature:
    20C 0,5C
    Relative humidity:
    45% 2%

    or:

    Temperature:
    23 0,5C
    Relative humidity:
    50 2%


    SOLUTION 3 : MEASURE BOX

    Precision air conditioning MEASURE BOX

    Available various air volumes specified chosen by the customer the "Measure box" is the ideal solution to get an extremely satisfactory precision air conditioning of parts (for example commonly used for Johnson gauge blocks) inside a small air volume preliminary chosen by the customer and guaranteeing the tolerances here below:

    Temperature T1:
    (20-23) 0,01C
    Temperature T2:
    (20-23) 0,1C
    Temperature T3:
    (20-23) 0,5C
    Relative humidity:
    50 2%




    FEEDBACK
    Prof. Guglielmo M. Tino (Dipartimeto di Fisica e Astronomia and LENS Laboratory)
    Universit degli Studi di Firenze
    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    POLO scientifico - Via Sansone 1 I-50019 Sesto Fiorentino (Firenze) ITALY
    Tel.: +39 055 457-2034 (Office) - 2214 (Lab), - 2462 (Lab)
    Fax.: +39 055 457-2121
    Email: guglielmo.tino@fi.infn.it
    Web: http://coldatoms.lens.unifi.it/tino

    "... In several occasions I had the opportunity to advice other colleagues about your excellent realization of the precision air conditioning system of our MAGIA laboratory; that was an essential element for the success of the MAGIA experiment whose goal was the accurate measurement of the gravitational constant G which is a fundamental physical constant of metrological interest. ..."



    Dott. Vincenzo Greco (CNR Istituto nazionale di ottica)
    Largo Enrico Fermi, 6 50125 Firenze (Italy)
    Tel.: +39 055 2308271
    Fax.: +39 055 2337755
    Email: vincenzo.greco@ino.it
    Email1: vgr.greco@gmail.com
    Web: http://www.ino.it/home/greco/

    "... As anticipated by phone call we perform temperature measures inside our conditioned room for a period of 3 hours with time sampling of 5 minutes. The data anlyses shows that in 1 hour the flunctuation of temperature values in correspondece to the average value is +/- 0,1 C (measure uncertainty 2 sigma that represents for a normal distribution corresponds to a level of reliability of 95%) ... "



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